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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b11549a2eb41f16ceb2cab93fbe3cf6332ead0d48aa0553128370a500e021d' 
  AND token = '08zK5e44n7zX49oOnRoOXBTjXIPEgkhsshV/3rqG7aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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