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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e7cc197a688c559aab1d7b3b4cfcf90ee09772c9a0aec0ae2e1a01fad63b57c' 
  AND token = 'r7+AkFIHdnpjoY9GCqXMYUI9of0xahpJBKkGu9uRTX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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