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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d00d74037e0d43f2122b89fb7e4f40ee0c47665fe7da1ead460f8831931af6f' 
  AND token = 'yi5586USX6CRxj1O2sZZ2J7/JTWg+Xo4xsHfigTOLzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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