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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1e0df53f3b3b3881190559b6ab8dca20e6ed971c7633d70c5e86d4d07920ee2' 
  AND token = '6jEQJ/2QA0l10LAV+/uxDXgBJb418RaA38yWnL1BzGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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