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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93390937bb44f9e7f8dc2277ae906be1f4b62596897f09b366df6551e72f8b15' 
  AND token = 'IN8KxIRWGsDxNo4BgLg8nT5AFZrcq0Cb2HYBOvx4doM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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