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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88878e0c5a82c2cc24452d45dfa4952fa82868bf25680acf6dc3f15313a44ce6' 
  AND token = 'o6uJrG4YV45M4l2AnDtFKWs5l4cQDuNrXdqTG2mTfpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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