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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df482247683dfdc02eb9563b6528b7d1660b32294fcb95b7bb46fe0fe6db1e4' 
  AND token = 'ak97nZGsKXfvBeO1p2vtS6/yAvK3B+J/pKd3JEENLwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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