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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '010ba35ca95daa151171ab6103188ac54385c8ea98f73ccc265ceeec0852d554' 
  AND token = 'juyUe20yz/UmLckOp2ocIWp/A9+LnM7CsCEqZmaZ3bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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