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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19b3a38c19f37a875f1811c5ceaa36b9d86335921646414be59277107da4d46' 
  AND token = 'omSdRVv1aLeYYz4t37AXl5boOjjBFunN3Ttu87ikT5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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