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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '828f11e146751122dc6a2670606170bfb7bdf7e73563694b9062834c2cc2847c' 
  AND token = 'mEAsMfe+U8eFy4n/oIaJraouCQGJQV+k6moW+nZ8UzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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