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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71f88a8085397ab083ad2012ba71ac6a5a17315da840b0388cc56d96d9eee84' 
  AND token = 'lUwNAJ/x9TaG6hodbLo3V+95dQ71wX2e2Qzep31ukhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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