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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c05e34c8c8fcb8f4a2481a12ffd33249adb4413cf778ba1e80ba44981f230b74' 
  AND token = 'Zlns/2Zjyr8rq+I/H2KtpNSc285r8R5e4K7lAEHJwEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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