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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3861090ed0cbc093bae01c9759408c0dd9b31c19ac9ec8e11b952e39328e83d' 
  AND token = 'Zwngm1v3yQn7PodbUYYL4GtqNvr19wjGrFQNExPNWKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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