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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '836277300bce4ec86caea99af727061ff7e8d29d57c72f1c717d7a2e85e7d308' 
  AND token = 'Ix/6F9ECtf+kJCbys5vaX3ipPHJfrObo0pXz2qsEsKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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