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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66d2b2cebe3db56dbabd985153400583e99bddc1c4d1b0ad9aa561bd54511b00' 
  AND token = 'jSAYG9ZP40TvieIO/Pc63ixEdMYjExnuQ66BJHCeUhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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