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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833fbcc8876d1d70d5c87ab574024715dbc788983e77d3d78cea3fa4c1afbbcf' 
  AND token = 'XwihpdC3Pm2dyA06U0MtXALGPBRjoMEUotuMACqhwCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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