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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2729ff8b107649419b6eb89bc417308ae791ab3d00f4b74a0050ee40839f54a' 
  AND token = 'd6vPVHyO4l55m6qg3Dv2cajN3PyOvSPG+LugGciy1Yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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