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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a25840474e98d254f622b70d1b989a0078aef9e0e11d9ce8a635ab5f8d0500e2' 
  AND token = 'E8Qw/Z7b69zqfoHbETCzooDpicPKnmGRGVydnFPABpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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