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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bbec6e7f90a04a60513b2af86d21df2555f9987643793ce97be85f56b1e4efe' 
  AND token = 'H5UAkcFIh3FPDDyhUKu5gYSc3SlF/e/Qu+VLud02QZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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