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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aec14f6f02e246dd299eb2dcb3631103231f4ec4a58ab85faea726022b6b328' 
  AND token = 'nJdqsgkJU4L3UidKJGqjGc4ocpCUgHBbFFXKOYNtawk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00483

JSON explain

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