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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a6547984f1cc6bf894c01b6aac189ee55cf995314797c2832acd9b84734ecad' 
  AND token = 'Zxzgi86rrjNzMgcszXuGtMU8N3jIV9VJY0KSMFte7i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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