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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69afb0c4ad82ec22e603fbdf0a7a46ed71d96809d120d8af921e0c5af874cded' 
  AND token = 'trap4tRBg96ExhR1lZJWh9ONtCxm/q64dvCePFzi4/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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