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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9d7511ebcd1c7efefdfed6c70cb56d8ad63152e15e10435f9843becf18c5a03' 
  AND token = '4ro7BiAQjIWjhJhq9n896A1Ke6fPwwqBXzgP9oR3IhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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