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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30fca3bc34cb4cc885d58e3e2d9134d08a5011f00e73cab0e3d50a1b0066c674' 
  AND token = 'ERWFj2Ibucb9FDiNPic+v7Bk44MooYV7zcT5NzRBZkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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