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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8eb0d079bcd702232bb4cfd5fe7baefc336817fda9a6a2ba4d554bfe2f6d113' 
  AND token = '91CcS3rxCMp8xB0CmYDCKukW0N1DEg74B8/5ujziCCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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