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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c19856bb356b75271f09ccb960b1f24ce1e2c535496edfe164c61db07aa112a' 
  AND token = 'VVBiMv0UC/Nh5aVlgNGMBSDzVKSVWVdT0lssrx4+F+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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