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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f85fe2ad8aad12fab2cdbff4178ae378e4ec419d12178e5b4f58d6976b84ae' 
  AND token = 'RCTTe4cZ0aHs+uAruOxI381nS0dOlny/r9tOoSfT9zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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