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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5296852ab2d41d3fad27a9487452a2bba445c400733bc4303fd760c90216e20' 
  AND token = 'Rr0yp4AqOmQkFGbz8uDbg/krjRTPf98OLIJpM6Ke0/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}