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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb729579b5f64127fea3aafc05bb45f0cfe2ba8b647d15a8e3c5fe7f72e04528' 
  AND token = 'c398yamWx8qSuNtE/qdvMasIHWvcwAK+ouOf54wQswQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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