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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f230c7723c7697ac9d69306c86f8dd959b25cde40446250afe0d9137c39bfc5' 
  AND token = '62Wx0Se09h4bLQbjmA1Nk/TgsjVzqn0In3pu5P3/lpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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