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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0674549f5fded51319bb27c1fccaa8fd7ad158d783824dfd61312a6cf232813d' 
  AND token = '4qC68DH1eREPEIfv1AEaP3LipPzLnjmlaYPtoX3Ejr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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