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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc6b32941b9b574b7cac258f45a979ef927fe4325bd52979429e287cd1fe521' 
  AND token = 'xdsmEbKPBMioYULUoNvZAZCND/04NMmylBP0Gen9lpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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