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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bab77a51fd127368de3ef58e6b1e3f9cf33dc8ca5afe1f7a63993532b89045e6' 
  AND token = '6T1rEIiMCgkBp/8QyUQaJmMOsoEg6iEgmTgNZNG2kPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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