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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe43b5bbb1a9429f6e0c677bb4e605040a13155484136cb4e88823fd1fe2388a' 
  AND token = '84EZTOd+MPRm+lJ3ui/GnRmnt9XNox6LauNn3GZKbjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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