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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a563645c76e672c76199c06e1ae943f4f26f4ae91bcecbebc1775add4e8f771' 
  AND token = '/KRxvS3r9+oh+bYbUBNKb92taoAWrMdsY0al4LNwGG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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