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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4ca1564d9ec0c87bcd22bf3264fdb820a7e066e3084b512390f6e903921885' 
  AND token = 'YZiC8ITjQ0VsVxVPCTqRCLy9ufL8N74J7UzDwSEcq0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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