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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0ba5b279aa7aee310da3f3d9a4a51f37bbaf337322c27cff78bee4e2add92f4' 
  AND token = 'bVU+QIJN8TzWpr1WTxtv/mpxC8yJZSzvzQU4BTL8vdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00239

JSON explain

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