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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f550ab542e6b3df48125530e1d815e2e2a9c73ea5aced9c95072158fcd8dcc' 
  AND token = 'IPoaSOTcpXS6s1+Cwqcp58W8fn467iQw30RJeT8mq9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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