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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7334ae9c8e777b63253442e886628c07cc93730e20286c354d493ac6ba7b278' 
  AND token = 'krXRLhbcQJLfx89OIMd1vaVjNNzaMZm/s+vgjvZ6tug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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