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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f1f3689c4746785a4adaa9de14c2b8d6901103a6d6ad3833507d25216eb4365' 
  AND token = '0LBy7DYeUCHO1fNA8iqKIgo853M/I90vn4LvEAdTy6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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