SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b8568752a2f1a794b14288f29b61f27f2f0f4d347d3b0f59443b3acb0790a5' 
  AND token = 'FZ7RmERn8n4gpZxgVdjzdZp898gJoBihAy+ypXvAjx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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