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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '114bb8a59d9e71abcff24f54c02cf2efe3f04baa74b921c3d127fc8e3684661c' 
  AND token = 'cjYX+I47G8vs6sRBbjm1rGugGqpx1pUZ5s7fDqm3p1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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