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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '726afb82962cd30738068fb42d6b2ad4e15e5724bcb2be746037be867e5cd919' 
  AND token = 'mM4Sv8yhOBn1ue0LXlqTE5J1cCA2uc3UcGsAOVm7LKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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