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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7cfbb715c599545211c83e94ca65a6864cca2f5666407d1b52a2b933e94a980' 
  AND token = 'Sc4PRpKHs/MDNmoyiGK/mz8wW1atRHar18xzLVT/C4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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