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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f2e04b9be98321c598c6fce0b1eb2b05d06e91488eab7c5618cb20c20425d7' 
  AND token = 'MwD7egLzOarzcNLAeHxF7MTLzgJNYBqQRcBs9xPW8x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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