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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8cb0676cdeb14c9dc98f83bba95b62adbac1e37ebbf394dd19a54ccfc09969b' 
  AND token = '66ysx3gyvSjLAOcQ4bHZRp3Yan12G5rWYs25jJxVva8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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