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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12c67062e5ca0c9d0cfbf80e41627c3062c09058e4517f39acc9464a5bc8c275' 
  AND token = '88Ztb9ATAWplcQuG3NlJH2cQDMZ/zVsVUIT/l+wneg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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