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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd03c9647b88286041f8d20a0a041e32912ec09437e40963f5a3474a6bf70af0e' 
  AND token = 'a/ZZ9eSxeuqdbbjn9Qh+dgs0dGy15k1YH0BlB2glhzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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