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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b06f562a061abe0cfee9f305fceb39f7ca5b6adbc6254360252b889d9174ad17' 
  AND token = 'aeZr9j51vJNvHmNdQwCrW0b0Et5sKVD7NHfduzJ5/nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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