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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6902ae1ec90c1bc1c2728d7431063cd43e94e837c984e709f38613281237f0e8' 
  AND token = 'fYJu11WIfaCLdJ9d5vjw+gtYRktpLHE9as6YFNj69NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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