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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb8cf03d1790daf50bb7d9f886c8a9564648323506f0c29beedbbc6ad96df1d0' 
  AND token = 'nt/pHjhigXL/Qe0l7IepjDFd6FJNc/HbT+Cyfg4TjDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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