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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2add4163b5d0020c4bdc22cd0371220b94ffdf7723d28bfcc21eb3d393dd6b9b' 
  AND token = 'TbhxCFEhYmm+rrrznCO6pGSlD+NPlF459+NMJ3lT2q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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