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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86086cb27b299941ae76f9d31cc135ec180ed5b6a18b38344455cabf9ca1d155' 
  AND token = 'SxCOerBleDmQHRZ+a11+XyP1RAuJDWr0HV/VdtEvv/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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