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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b31cb7f31e6ca0557d56a4dafda0ea639f483176ece101a5ff76588ecfad72dc' 
  AND token = '5lPEoP40HND/vii5g1KtSmjSuTzCjJVRFn4Y8sqsLQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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