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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '277f4f9edb9f7b71bf452a7f94bb0ac2525a29bb3d12e28ecf3c6d86cdd1063e' 
  AND token = 'xi3pGVc0K0quD3JIEYIfMSQGA5fsfJ/tDiJFUqtQA38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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