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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4549fd1cec827fa5db1b879df674a44c9b34feaf813f7d2c7f8ef009233f0d75' 
  AND token = 'CxdQPKJmaKJNhaF3OrP87FknzSYbFCN6PAKff4/4k84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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