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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd614b2e2d6c7a24f76f82086230610b595aa1740eb1ce8abbfe98fa9d17be2' 
  AND token = 'r0p6Ez4yS1k0YVZOVKy6RgLkySB7QEInRBMq11DFjqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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