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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c66e71899552a8d7f1c788cbee5e40f8fbb590aea77e31405f2bc98e90985a1' 
  AND token = 'pkq8oOCa4NyJ8cFkGVRbLKdchADYPffffJ+yf3DyYJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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