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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26877e6e484ea593b208b30b2b0b296746e085ca4513cf8068b61e0b363408fd' 
  AND token = '0/trXy/qIodEoc3Nq8eHsbqBU6geB0IEjo2m6JbNNMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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