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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa41451d3c3e6eda39444ea402572b4dcf4ea3d9958a112afa36e921bf8c6f41' 
  AND token = 'p6gBwAZunBrE2BrOHFdu4d7wFIv10ZcfREBe3liWg7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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