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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a030ea117f42a731af50fa28f33d4db6d8baa63c0b68871fc6723905a4a0669' 
  AND token = 'Q9bb7zlw+Tc7QlYUSXlBp2+WXcUDDND3cN0Usr3Xr5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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