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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '217cc821bb323cfde8261e3a81da291fb503e95764850fcee4b541e9af3d36d9' 
  AND token = 'oSYXuuHe+CbhqmsTokBFQ35z78krnnW2sqaBrwtGItk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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