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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '472a42d321f276f0ddfd7419a82be926ff00dbee08e915aeacced82b2f31adbd' 
  AND token = '1asP0F6lIZ0E0Mo/JnY7Omuqj6NdZUNmyzY8tie2b0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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